Representatives for IBF junior welterweight titleholder Lamont Peterson have submitted his medical records to the IBF in dispute of the fighter’s positive drug test for synthetic testosterone, which cancelled his rematch with Amir Khan.

Lamont Peterson has been stripped of the WBA 140-pound title he won from Amir Khan as a result of his failed pre-fight drug test, according to Golden Boy Promotions’ Richard Schaefer. The vacant belt will be on the line when Khan challenges WBC titleholder Danny Garcia on July 14.

Lateef Kayode’s cruiserweight bout with former light heavyweight titleholder Antonio Tarver is to headline a Showtime-televised, quadruple-header from the Home Depot Center in Carson, Calif., on June 2.